Weft threads carrying device for circular weaving looms



G. CASATI ET AL Aug. 2, 1955 WEFT THREADS UARRYING DEVICE FOR CIRCULAR WEAVING LOOMS '7 Sheets-Sheet 1 Filed July 5, 1951 INVENTORS. SAT/ CAZz N/ A G/usTo A RLo BY PI D g- 2, 1955 G. CASATI ET AL 2,714,396

WEFT THREADS CARRYING DEVICE FOR CIRCULAR WEAVING LOOMS Filed July 5. 1951 7 Sheets-Sheet 2 INVENTORS. Gws-r CA SAT! AND ggRLo CAZzA/Y/ GP) I a a 1955 G. CASATI ET AL 2,714,396

WEFT THREADS CARRYING DEVICE FOR CIRCULAR WEAVING LOOMS Filed July 3, 1951 7 Sheets-Sheet 3 INVENTORS. TO ASAT/ AND B $RLo CAZ y 1955 G. CASATI ET AL 2,714,396

WEFT THREADS CARRYING DEVICE FOR CIRCULAR WEAVING LOOMS Filed July 5, 1951 '7 Sheets-Sheet 4 50 FIE. 10.

INVENTORS' G/usro CASAT/ Arm T lfj -u CAZZA/IIG-A 104 104 H Aug. 2, 1955 G. CASATI ET AL WEFT THREADS CARRYING DEVICE FOR CIRCULAR WEAVING LOOMS Filed July 3, 1951 '7 Sheets-Sheet 5 INVENTORS. CASA-r/ Ar/D CAzZAIY/G-A Aug. 2, 1955 G. CASATI ET AL 2,714,396

WEFT THREADS CARRYING DEVICE FOR CIRCULAR WEAVING LOOMS Filed July 3, 1951 7 Sheets-Sheet 6 mus-r0 CASAT/ AND I:I CARI-o CAZZA/l/GA "4-1 I I, Q /(k A a? Aug. 2, 1955 r G. CASATI ET AL 2,714,396

WEFT THREADS CARRYING DEVICE FOR CIRCULAR WEAVING LOOMS Filed July 5, 1951 7 Sheets-Sheet 7 INVENTORSf GIUSTO CASAT/ AND CARLO CAZzAr/lf-A United States Patent WEFT THREADS CARRYING DEVICE FOR CIRCULAR WEAVING LOOMS Giusto Casati, Barzano, and Carlo Monticello, Italy Cazzaniga,

It is an object of the present invention to provide a weft threads carrying device for circular weaving looms, which among other features is characterized in that the weft carrying spool is carried by a carriage which is attracted by an electromagnetic roller. The device according to the invention is illustrated by way of example in the accompanying drawing, in which:

Fig. 1 shows the device, in a complete side view,

Fig. 2 shows diagrammatically, the detail of the rollers, and the direction of their rotation in respect to the warp threads;

Fig. 3 is a perspective view of the electromagnetic roller and its respective connection means to the weaving loom;

Fig. 4 is a front view riage;

Fig. 5 is a front view of the position taken by the bobbin when it is placed on the carriage and illustrates the angle which is formed by the spool axis with the warp threads;

6 is a left hand view in respect to Fig. 4, of the carriage.

Fig. 7 is a view similar to Fig. 5 but showing a side view of the spool during the lift of the warp threads;

Figs. 8, 9 are respectively a larger scale front view, and top view showing the detail of the assembling on the carriage of the loom stopping operation devices in the case when the weft thread is broken, in normal working position.

Figs. 10 and 11 show on a larger scale the position taken by the loom stopping devices after the weft thread is broken;

Fig. 10a is a sectional view on an enlarged scale taken along line 10a -10a of Fig. 10;

Figs. 12 and 13 are a larger scale side view and top view respectively, device in the case running;

Figs. 14 and 15 are a larger scale side view and top view respectively, of the automatic loom stopping operation device, in the case when the carriage is displaced in respect to the electromagnetic roller.

Referring now to the drawings, the weft carrying device according to the invention is formed by an electromagnetic roller 1 (Fig. 1), which is pivoted on its spindle 2 and supported by the arms 3, 4; the latter are in turn secured to a sleeve M rotating on the central weaving loom shaft d (Fig. 3), the electric current being brought to the roller. by means of the brush 5 and the collector 6; an auxiliary roller 7 supported by and rotating on screws 8, 9 is located beside the first roller 1, and said screws 8, 9 are in turn fixedly secured to the arms 10 and 11 respectively, which are branched out from arms 3, 4 joined together by the rod 12. In order to effect the rotation of roller 1 around its spindle 2, when it is displaced around the weaving loom, there is provided on the end of the spindle 2 a bevel gear 13 which engages with a toothed rim b of a plate, which is secured of the weft spool carrying carof a weft thread breaking or abnormal of the detail of the loom stopping ill) 2,714,396 Patented Aug. 2, 1955 in a manner not shown to the headpiece of the guide tube 0 which encircles the main shaft d .of the weaving loom. The roller 1 rotates in the inner part of the warp threads fo; the carriage A which includes rollers 14, 15 adheres to said roller 1 on account of its electromagnetic attraction since the two rollers 14, 15 are formed of magnetic material (Figs. 1 and 4), both being pivoted on their spindles, which are centered on the bars 16, 17 of nonmagnetic material and said bars being joined together by the rod 18 of magnetic material having also field intensifying purposes. Thus the carriage A includes elements 14-18, among other elements indicated below. Both rollers 14, 15 having a length equal to that of roller 1, are joined together by rubber belts 19, 2'3 for joined rotation; said belts while slightly projecting from the profile of the rollers, hinder the direct contact of roliers 14 and 15 with the electromagnetic roller 1, whereby the warp threads are obliged to pass between said magnet roller and the rubber belts 19, 20. The roller 14 is provided with headpieces 14 and 14 having a slightly greater diameter than the remainder of rolle1114 and a toothed periphery and which are able to adjust the carriage position with respect to roller 1; the purpose of the teeth is to prevent, during the carriage rotation, the warp threads f0 from suddenly jumping since they can insert themselves between the teeth interstices and thus maintain their perpendicularity. The carriage A is further provided with a funnel member 21 secured to the rod 18 and in whicl1-on account of equal conical shape of the weft threads carrying spool the latter can be housed with its cone-shaped part. Fun- Del 21 is provided on its front with a longitudinal slot 22 to facilitate the insertion of the weft threads unwinding from spool 23; said thread leaving the funnel is guided between two metallic discs 24, which are secured below the funnel 21, so as to adjust the tension of the thread before passing in the thread guide 25 (Figs. 4, 5) the thread guide being pivoted on the bent arm 26 secured to the bar 17. Figs. 5 and 7 respectively show the position taken by the weft thread carrying spool with respect to the warp threads f0, in side view, and between the lifted warp threads respectively. The guide 25 has a V-formed section (Fig. 10a), which is suitably tapered towards its lower part in order to quickly receive the weft thread ft without threading. In the case of a weft thread break, the loom stopping device illustrated in Figs. 8, 9, 10, 11, will act to stop the loom. Said device consists of a lever 27, one end of which is secured to the guide 25, whereas the other is pivoted on the rod 28 sliding in two holes 28 and 28" in the bars 17 and 16 respectively, the rod 28 being in turn pivoted on two arms 28b secured below the bar 16; the upper end of the rod 28 being suitably shaped, exerts a lever action on part 29 having an end 29' and a projection 29". Part 29 is set on a pivot 291' on bar 16, and the other end of part 29 is provided with a pin 30', on which the disc 30 having a diameter equal to the toothed portion 14 of the roller 14 of the carriage A is rotatably mounted. Said device 27, 28, 29, 30 which is put in action by the breaking of the weft thread ft, operates the lever system formed by the rotatable disc 32, which is pivoted on a bar 33, passing over arm 10, which slides in a guide 33 provided with a spring 34 weaker than spring 31 and acting on bar 33 to urge the same and disc 32 lightly toward disc 30; said bar is pivoted on the upper end of rod 35 which is in turn pivoted on the rod 36 secured also to the arm 10. An end 35 of rod 35 is bent at a suitable angle and acts like a lever on a rod 37 secured to the support of the mercury bulb 38; pivoted on rod 12. In case of a displacement of carriage A with respect to the electromagnetic roller 1, provision is made of another loom stopping device comprising a ring 39 located over a second smaller ring 40" provided with" cap-'screws41, 42', which are" respectively slidingly arrangedin slots 3s, 3's in the arm 3 and whereby the .screw heads bear. against the arm; such, slots are. provided with springs 43," 44. To the head of'the screw 42'Jis ,secured ,a bar 45 pivoted on therod 46; which is.jointed in turn. to the .rod 47, acting as a lever on the support of another mercury bulb 48"pivoted, on the rod 12. The above set forth weft carrying device operates as follows: after having put in. rotationthe sleeve M of'the circular weaving loom on whichthis device is fitted, the rollers 14, 15, as shown diagrammatically in Fig, .2, rotate round .the main shaft d of the loom; inv the direction of arrow x. and then the bevel gear 13, keyed on the pin 2' of the electromagnetic roller 11 (which may, if. desired,.be substituted by a permanent .magnet) and engaging with the toothed rim b rotates also the rller,1, .in thedirection of arrow consequently the. rollers 1415 of the carriage A which areplaced outside the .warp threads f0 are attracted by roller 1' and put in rotation in the direction of arrows z, z. Thus-the auxiliaryroller 7 being in contact with roller 14 rotates on its spindle in the direction of the arrow. y; and said roller prevents also the carriage A from sliding onthe face .of roller 1; in this manner there are provided two rotation directions, which allow the rollers to rollon the warp threads f0. The Weft thread. it (Figs. 8, which unwinds from the spool 23"housed in the funnel-21, is carriedby means of the guide 25' between the warp threads f0 and thus performs the weaving of the fabric. The device stopping the loom in case of a break in a weft thread ft operates in the following way: in normal working position, the stretched weft thread ft, coming out from the guide 25, keeps the latter in the inclined position shown in Fig. 8, and the parts 27, 28 take also the position shown in said figure, equilibrating the action of the spring. 31, which tries to. rotate the shaped part 29 on its spindle 291'; spring.31being a leaf'spring fixedto one side of lever 29 and extending aroundpivot '29i to urge lever 2')from-the position of Fig.9 to thatof Fig. 11. When the breaking of the weft thread jt' occurs the guide 25 being freed from the thread stretch, takes the position shown-on Fig 10 as the lever- 29 turns underthe action-ofthe spring 31, whereas the rod 28', which in the normal equilibrium. position (Figs. 8, 9) bore just lightlyon the projection 29 of part 29, is pushed by the action of thespring 31;towards the side of said projection 29", so as to bear on the end 29 of the art; wherebythe disc 301is displaced, passes the plane of I warp threads, f0 (Figs.- 10, ll) andfpushes against-the rotating disc 32, displacing .thereby the bar 33r(Fig.v 13),,which in ,turnpushes the rodv 35 in man ner that'its end 35", bent ata suitable angle, is dis placed in opposite direction, placing again in equilibrium, onthe plane, the mercury bulb 38 .and thus closing the circuit which determines the loom stopping. As soon as the. weft thread is againstretched, the part of the device on the carriage A takes automatically its normal position (Figs.y8,x9), while the'remaining'part'of the operating deviceisbrought in its normal .position by the spring 34;itis understood that it is necessary to start again the loom'by' operating theswitch provided for this purpose; In the.case ,when the carriage A'is displaced in. respect tothe electromagnetic roller 1, the other loom stopping'deviceacts as follows: (Fig. l4)'the toothed part 14 of the carriage roller 14; projects slightly, in. its-normal running position on the electromagnetic roller 1, so as to push'the ring 39, located thereupon, in the direction towards the loom center, whereby both screws 41', 42*secured to the ring bearingv on the ring 39, are displaced in the same direction and thus the lever, system '45, 46, 47 brings the mercury bulb 48 in non-, equilibrium position, leavingopenan electric-circuit. As soon as the carriage A is displaced, on account .of an abnormal operation of the latter, in respect to the roller 1, the toothed rim 14"ofroll6r 14"allows the ring 39 to move tothe leftyas viewed in Fig. 14, on account of the action of the springs 43, as on the screws 41, 42 and a very little displacement is enough to restore the mercury bulb equilibrium and thus cause the closing of a circuit which determines the loom stopping.

Weclaim-:-

1. A wettthread carrying device for circular weaving looms comprising, a-main loom shaft, a'magnetic roller, an auxiliary roller adjacent said magnetic roller, a sleeve rotatablymounted. on said,main shaft, connecting arm means securing said "magnetic and'auxiliary rollers to said rotatable; sleeve, v apcar'riage havingtwo rollers: of

. magnetic material adapted to be located outside the warp threads and aimostadherent to said magnetic roller, resilient belts arranged on said two rollers to maintain the latter spaced from said magnetic roller, a funnel adapted'to carry a Weft thread spool andfa V'shaped, bent weft thread guide tapered towards its lower part, an arm whereon said guide is pivoted, andabar of nonmagnetic material to. which said arm and funnel are secured and which forms parts of said carriage.

2 Aclevice as claimed in claim 1, wherein said funnel is inclined. to said 'main shaft to support the weft thread spool in an oblique. position in respect to the main shaft of'the loom.

3; A'device as claimed in claim 1, including tWOBJltO: matic loom stopping devices, one of which operates-in the case of Ta weft" thread breaking, and theother in the case of 'the displacement of said carriage in respectto said magnetic roller.

4. A device as claimed in claim 3, wherein the auto: matic loom stopping operating device for'the case of a weft ,thread breaking comprises a lever means "connected'to said weft threadguideand controlled by its. position, spring means connected to and acting incombination with said levernieans, a rotatingdisc on said lever means maintained in equilibrium by the action-of said lever means and said spring means and beingigrazed by the warp threads having a perpendicular position in respect to it, a second'rotating. disc. adjacent said first disc and located on saidconnecting-armmeans, a sys: tem formed by bars and by a rod having a bent endto which said second disc is secured, a mercury bulb. on said connecting arm means to effectlhe' closure' of w an electric circuit and thus the loom stopping and this when said equilibrium is destroyed at the: momentofc the breaking of the weft thread, whereby said first disc". is caused to be displaced with respect to: the warp threads and exerting a pressure on said second disc, and. whereby further said mercury bulb is caused to be brought again in equilibrium.

5. A device as claimed in claim 3, wherein the autoi matic loom stopping operation device for the caserof a; displacement of said carriage in respect to said magnetic roller comprises a first ring bearing; on said magnetici. roller, asecond ring located overthev first ring,: two? guide screws secured to said first .ring and being able to slide in holes which. are providedinsaid connecting arm means, spring means urging said screws toward said carriage, a lever-and-rod system connected to one. of. said screws, a mercury bulb connected to andmaintained. in equilibrium position by, said le'ver-and-rod system, which position. is destroyed as soon as one of said carriage forming rollers is displaced in' respect to. the said. electromagnetic roller, whereby the respective electric. circuitis closed, thus determining ,the loom stopping.

6. Weft thread carrying apparatus for circular weaving looms comprising, in combination, a main loom shaft;

support means turnably mounted on said main loom shaft for rotation thereabout; a first magnetic roller turnablyI supported on said. support means distant from said main. loom shaft for rotation about an axis parallel .to the. latter; a carriage adapted to be located.onthe-opposite,

side of warp threads from said first magnetic roller and including a second magnetic roller parallel to said first roller and located next to the same by magnetic attraction; band means passing about said second roller to prevent the latter from contacting said first roller; and spool carrying means mounted on said carriage for carrying a weft thread spool.

7. Weft thread carrying apparatus for circular weaving looms comprising, in combination, a main loom shaft; support means turnably mounted on said main loom shaft for rotation thereabout; a first magnetic roller turnably supported on said support means distant from said main loom shaft for rotation about an axis parallel to the latter; a carriage adapted to be located on the opposite side of warp threads from said first magnetic roller and including a second magnetic roller parallel to said first roller and located next to the same by magnetic attraction; band means passing about said second roller to prevent the latter from contacting said first roller; spool carrying means mounted on said carriage for carrying a weft thread spool; and a third roller parallel to said first and second rollers, turnably carried by said support means, and being located next to said second roller.

References Cited in the file of this patent UNITED STATES PATENTS Ancet Ian. 6, 1948 FOREIGN PATENTS Great Britain Aug. 12, 1948 

